camelback
noun
°The backs of camels.
"We travelled across the desert on camelback."
°A flexible water container worn on the back.
"An empty camelback is a blessing and a curse; it means that it is easy to carry, but it means you have no water."
adjective
°(furniture) Having a shaped back; particularly a shape with a raised middle.
"The Victorian camelback sofa looked out of place in the brightly lit room."
°(more generically) Anything shaped like the back of a camel.